Patents by Inventor Kenji Fujiwara

Kenji Fujiwara has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Peptide derivatives and a method of measuring collagenase activity
    Patent number: 4138394
    Abstract: Peptide derivatives are obtained by eliminating the masking groups from masked peptide derivatives in which the guanidino group of an arginine residue and the carboxyl group of the arginine residue are masked. The guanidino group can be masked, for example, with a tosyl, nitro or benzyloxycarbonyl group, and the carboxyl group can be masked by converting it to an ester group, for example, a benzyl or t-butyl ester group. The masking groups can be eliminated using hydrogen fluoride, for example.
    Type: Grant
    Filed: January 21, 1977
    Date of Patent: February 6, 1979
    Assignee: Ajinomoto Co., Inc.
    Inventors: Shumpei Sakakibara, Yutaka Nagai, Kenji Fujiwara, Takahiro Sakai